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US 3,995,077 AGranted
Process for treatment of wood
AssigneeHager Aktiebolag
InventorBror Olof Hager
Life of this patent
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Abstract
Wood is impregnated with a solution of a preservative in a vaporizable, water-free, organic solvent and thereafter treated with a warm high-boiling oil composition under subatmospheric pressure conditions effecting evaporation of the solvent used in the impregnation step.
Claims11
In a process for treatment of wood, involving the steps of impregnating the wood with a solution containing preservative in an evaporable solvent;
- thereafter treating the wood in a warm high boiling oil composition under vacuum so that the solvent evaporates from the wood;
- and thereafter removing the oil composition from the treating vessel under maintained vacuum, the improvement according to which
- i. the evaporable solvent is an organic solvent having a boiling point of below 200.degree. C.;
- ii. the high boiling oil composition has a boiling point of at least 250.degree. C.;
- iii. the high boiling oil composition is maintained at a temperature between 60.degree. and 110.degree. C. during the evaporating period.
2 more elements
Dependencies are inferred from the claim text.